package com.atguigu.gulimall.search.service.impl;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private ProductFeignService productFeignService;
    @Autowired
    private RestHighLevelClient restHighLevelClient;
    @Override
    public SearchResult search(SearchParam searchParam)  {
        SearchResult searchResult = null;  //封装结果对象
        SearchRequest searchRequest =   buildSearchRequest(searchParam);
        try {
            SearchResponse response = restHighLevelClient.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS); //    去 es中查询
        searchResult =buildSearchResult(response,searchParam);
//            SearchResult searchResult1 = buildSearchResult(response, searchParam);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        //接下来,分析响应数据
        return searchResult;
    }
    /*
    处理 es返回的结果,把他变成页面需要的结果
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if(hits.getHits()!=null   &&   hits.getHits().length>0){
            SearchHit[] hits1 = hits.getHits();
            for (SearchHit hit : hits1) {
            String sourceAsString = hit.getSourceAsString();
            SkuEsModel esModel= JSON.parseObject(sourceAsString, SkuEsModel.class);
            if(!StringUtils.isEmpty(param.getKeyword())){
            HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
            String string = skuTitle.getFragments()[0].string();
            esModel.setSkuTitle(string);
            }
            esModels.add(esModel);
        }
        }
        result.setProducts(esModels);
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        List<SearchResult.AttrVo>  attrVos =new ArrayList<>();
        ParsedNested attr_agg= response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");


        List<? extends Terms.Bucket> buckets1 = attr_id_agg.getBuckets();
        for (Terms.Bucket bucket : buckets1) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            long attrId= bucket.getKeyAsNumber().longValue();
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();


//
//            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
//                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
//                return keyAsString;
//            }).collect(Collectors.toList());

//
            Aggregations aggregations = bucket.getAggregations();
            ParsedStringTerms attrValueAgg = aggregations.get("attr_values_agg");
            List<? extends Terms.Bucket> buckets2 = attrValueAgg.getBuckets();//attrValueAgg 是空的
            ArrayList<String> attrValues = new ArrayList<>();
            for (Terms.Bucket bucket1 : buckets2) {
                String keyAsString = bucket1.getKeyAsString();
                attrValues.add(keyAsString);
            }

//


            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        List<SearchResult.BrandVo>  brandVos=new ArrayList<>();
        ParsedLongTerms brand_agg= response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            long brandId= bucket.getKeyAsNumber().longValue();
            String brandName= ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
        brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        result.setPageNum(param.getPageNum());
        long total= hits.getTotalHits().value;
        result.setTotal(total);
        Integer  totalPages= (int)  total%EsConstant.PRODUCT_PAGESIZE==0?(int)total/EsConstant.PRODUCT_PAGESIZE: (int) (total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(Long.parseLong(totalPages.toString()));
        List<Integer> pageNavs = new ArrayList<>();
        for(int i  =1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
//       构建面包屑导航功能
        if(param.getAttrs() !=null  &&   param.getAttrs().size()>0){
        List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            String[] s = attr.split("_");
            navVo.setNavValue(s[1]);
            R r = productFeignService.attrInfo(Long.parseLong(s[0]));
            if (r.getCode() == 0) {
                AttrResponseVo data= r.getData("attr", new TypeReference<AttrResponseVo>() {});
            navVo.setNavName(data.getAttrName());
            }else{
                navVo.setNavName(s[0]);
            }
//      如果取消了这个面包屑之后,要跳转到哪个地方>?
            String encode=null;
            try {
                 encode = URLEncoder.encode(attr, "UTF-8");
                encode =   encode.replace("+","%20");
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException(e);
            }
            String replace = param.get_queryString().replace("&attrs=" + encode, "");
            navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            return navVo;
        }).collect(Collectors.toList());
        result.setNavs(collect);
        }
        return result;
    }
    /*
     把普通参数 变成es查询参数,变成DSL查询语句.
     */
    private SearchRequest buildSearchRequest(SearchParam  param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        BoolQueryBuilder boolQuery= QueryBuilders.boolQuery();
        if(!StringUtils.isEmpty(param.getKeyword())){
        boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        if(param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        if(param.getBrandId()!=null   &&   param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termQuery("brandId",param.getBrandId()));
        }
        if(param.getAttrs()!=null    &&    param.getAttrs().size()>0){
            List<String> attrs = param.getAttrs();
            for (String attrStr : attrs) {
                BoolQueryBuilder nestedBoolQuery= QueryBuilders.boolQuery();
                String[] s= attrStr.split("_");
                String  attrId=s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
//   每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery= QueryBuilders.nestedQuery("attr", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        if(param.getHasStock()!=null){
        boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }
        if(!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery= QueryBuilders.rangeQuery("skuPrice");
            String[] s= param.getSkuPrice().split("_");
            if(s.length  ==2) {// 说明是区间查询
             rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length ==1){
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }
        sourceBuilder.query(boolQuery);
        /*
           接下来是  排序,分页,高亮
         */
        if(!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order=s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        if(!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder= new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b  style='color:red'> ");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }
        /*
        接下来是   聚合分析
         */
        TermsAggregationBuilder brandAgg = AggregationBuilders.terms("brand_agg");
        brandAgg.field("brandId").size(50);
        brandAgg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brandAgg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brandAgg);
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);
        NestedAggregationBuilder attr_agg= AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attrIdAgg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attrIdAgg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attrIdAgg.subAggregation(AggregationBuilders.terms("attr_values_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attrIdAgg);
        sourceBuilder.aggregation(attr_agg);
        String string = sourceBuilder.toString();
        System.out.println("这个是构建的DSL语句= " + string);
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX},sourceBuilder);
        return searchRequest;
    }
}
